Distinguishing and positioning method and system for underwater weak target

A positioning method and underwater target technology, applied in the field of sonar digital signal processing, can solve the problems of unsatisfactory real-time performance of the system, large amount of calculation, large aperture of the system receiving array, etc.

Inactive Publication Date: 2015-06-17
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the existing equipment with spatial filtering needs to be solved with the help of third-party optimization software, which has a huge amount of calculation and cannot meet the real-time requirements of the system and the large aperture of the system receiving array.

Method used

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  • Distinguishing and positioning method and system for underwater weak target
  • Distinguishing and positioning method and system for underwater weak target
  • Distinguishing and positioning method and system for underwater weak target

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specific Embodiment

[0110] Simulation parameters: the number of actual sound pressure sensor vertical linear array elements M=32, the distance between array elements d=1.5m, the depth of the sea area is 60.5m, the target signal frequency is 650Hz, the depth of target 1 is 7m, the distance is 5300m, target 2 The depth is 40m, the distance is 5300m, and the sound source level of target 1 is 10dB greater than that of target 2. The sound velocity profile as Figure 6 shown.

[0111] Such as figure 2 As shown, the specific steps of a kind of spatial matrix filtering method proposed by the present invention are as follows:

[0112] Step 1: Divide the detection area into a stop band area and a pass band area, where the observation area is selected as depth [0m, 62m], distance [4000m, 9000m], stop band area is set to depth [3m, 15m], distance [5250m] ,5350m], the rest of the area is set as the passband, discretize the depth and distance of the stopband and passband area respectively, calculate the co...

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Abstract

The invention provides a distinguishing method and system for an underwater weak target. The method comprises the steps that firstly, strong disturbing signals in a stop band are filtered out from receiving signals of a multi-sensor array through a spatial matrix filter, wherein the spatial matrix filter meets the condition that the pass-band response error is smallest under the constraint condition of a stop-band overall response error; then based on the receiving signals with the strong disturbing signals filtered out, the underwater target is positioned through a matched processor. The basic thought of the method is that the receiving array signals pass through the spatial matrix filter, a spatial matrix filter technology is used for the receiving array signals, the strong disturbing signals in the stop band can be effectively filtered out on the premise of ensuring that pass-band target signals pass through without distortion, and therefore influence on the detection and positioning of the pass-band target signals is eliminated, the underwater target is positioned through a conventional matched processor or an adaptive matched processor, and positioning of the underwater weak target is achieved under the condition of strong disturbance on the water surface.

Description

technical field [0001] The invention relates to the field of sonar digital signal processing, in particular to a method and system for distinguishing and positioning underwater weak targets. Background technique [0002] The underwater acoustic signal processing technology based on the multi-sensor array can realize the azimuth, distance and depth estimation of the target, and the technologies used are mainly beamforming technology and matching field processing technology. Since matching field processing can realize target depth and distance estimation, this technology has important application value in judging target type and threat degree. The widely used matching field processors are linear matching processor and adaptive matching processor. The theoretical research based on these two processor algorithms has been sufficient, and its processing performance has also been fully demonstrated through simulation and actual sea experiment data. . Because the possible location...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/06
CPCG01S15/06
Inventor 郑胜家韩东黄勇张春华
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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